Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eef5b7d940fff2a36d64f1ac784f669391365d23f4d052e52ae7331a9fcf7a99:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16